Implement redirect (#1073)

## Description

- Add redirect
- Add link to hosted web version
(https://gallery-flutter-dev.firebaseapp.com) to README

## Issues
#1072

---------

Co-authored-by: Parker Lougheed <parlough@gmail.com>

README.md

@@ -3,28 +3,23 @@
 **NOTE**: The Flutter Gallery is now deprecated, and no longer being active maintained.
 
 Flutter Gallery was a resource to help developers evaluate and use Flutter.
-It is now being used primarily for testing.
+It is now being used primarily for testing. For posterity, the web version
+remains [hosted here](https://gallery-flutter-dev.web.app).
 
 We recommend Flutter developers check out the following resources:
 
-* **Wonderous**:
-(
-[web demo](https://wonderous.app/web/),
+* **Wonderous**
+([web demo](https://wonderous.app/web/),
 [App Store](https://apps.apple.com/us/app/wonderous/id1612491897),
 [Google Play](https://play.google.com/store/apps/details?id=com.gskinner.flutter.wonders),
-[source code](https://github.com/gskinnerTeam/flutter-wonderous-app)
-):<br>
+[source code](https://github.com/gskinnerTeam/flutter-wonderous-app)):<br>
 A Flutter app that showcases Flutter's support for elegant design and rich animations.
 
-* **Material 3 Gallery**
-(
-[web demo](https://flutter.github.io/samples/web/material_3_demo/),
-[source code](https://github.com/flutter/samples/tree/main/material_3_demo)
-):<br>
+* **Material 3 Demo**
+([web demo](https://flutter.github.io/samples/web/material_3_demo/),
+[source code](https://github.com/flutter/samples/tree/main/material_3_demo)):<br>
 A Flutter app that showcases Material 3 features in the Flutter Material library.
 
-* **Flutter Samples**:
-(
-[source code](https://github.com/flutter/samples)
-):<br>
+* **Flutter Samples**
+([samples](https://flutter.github.io/samples), [source code](https://github.com/flutter/samples)):<br>
 A collection of open source samples that illustrate best practices for Flutter.

firebase.json

@@ -12,11 +12,18 @@
  {
  "target": "prod",
  "public": "build/web",
+ "redirects": [
+ {
+ "source": "/",
+ "destination": "https://docs.flutter.dev/gallery",
+ "type": 301
+ }
+ ],
  "ignore": [
  "firebase.json",
  "**/.*",
  "**/node_modules/**"
  ]
  }
  ]
-}
+}